Sheet N-501-EN: Plane-A trunks use TA only, plane-B trunks use TB only, and power and water stay below the floor

What this sheet shows

N-501-EN is the pathway plan, scale 1:150, units mm. The sentence under the top border states the drawing: fibre trays TL 400×100 (bottom Z3550) and TA / TB 600×200 (bottom Z3900) above the cabinet row, and under-floor wet / power-A / power-B channels (Y2250 / 2750 / 3250). The same sentence states the trunk rule: plane-A trunks use TA only; plane-B trunks use TB only. The row is drawn as two lengths along X. The upper length is scaled from 0 to 50. It prints A01, B01, A02, B02, A03, B03, A04, B04, A05, B05, A06, B06, A07 and B07, then OOB-A, CVS-A, SPA-1, SPA-2, SPA-3, SPB-1, SPB-2, SPB-3 and CVS-B, with FW-01, FW-02, FW-03, FW-04 and FW-05 above the trays. The lower length is scaled from 55 to 105. It prints SPB-3 and CVS-B again, then OOB-B, then A08, B08, A09, B09, A10, B10, A11, B11, A12, B12, A13, B13, A14, B14, A15 and B15, with FW-06, FW-07, FW-08 and FW-09 above the trays. A bar at the right of the lower scale reads 0 to 5 m and is marked 1:150. The caption under the scales reads: tray labels at left; under-floor channels at right: W = wet (Y2250, facility context), PA = power A (Y2750), PB = power B (Y3250). Network cabinet IDs are below the wall line, and the caption expands the first of them: A01 = NETA-CU01. The axis is marked X in m, while the title block sets the units to mm.

Separation in Y and in Z

The schedule at the lower left gives every route a size, a Y range, a level and what it carries. TL is 400 × 100, Y2900–3300, bottom Z3550. TA is 600 × 200, Y3450–4050, bottom Z3900. TB is 600 × 200, Y2150–2750, bottom Z3900. Power A / B is under floor, Y2750 / Y3250, below Z1030. Wet is under floor, Y2250, below Z1030. Note 1 is only about the three fibre trays: they are separated in Y and do not cross in plan. The printed ranges do not overlap one another. TB ends at Y2750, TL runs Y2900–3300, and TA starts at Y3450. The same note states that figure: TA / TB bottoms (Z3900) are 250 mm above the TL top (Z3650). Note 2 separates fibre from power and water by elevation: fibre is above the cabinet tops (Z ≥3550); power and water are below the floor boards (Z <1030): vertical separation. The Y column still needs a close reading against that note. Wet at Y2250 falls within TB's printed range Y2150–2750. Power A is printed at Y2750, the end figure of that same TB range. Power B at Y3250 falls within TL's printed range Y2900–3300. Y2250, Y2750 and Y3250 all sit outside TA's range Y3450–4050. Note 1 does not say the under-floor channels miss the trays in plan. It says the three fibre trays do not cross one another. The vertical separation is the statement in note 2.

What each route carries

The Carries column is the routing rule this plan is drawn to show. TL carries NIC and DPU jumpers of both planes (common route). TA carries plane-A trunks (leaf → SPA, NS → CVS-A) and plane-A OOB 100G uplinks. TB carries plane-B trunks (leaf → SPB, NS → CVS-B) and plane-B OOB 100G uplinks. The header states the trunk limit in those words: plane-A trunks use TA only, and plane-B trunks use TB only. The limit is on trunks. It does not take the NIC and DPU jumpers off TL. The cabinet IDs named in the trunk descriptions are printed on the plan. After B07, the upper length reads OOB-A, CVS-A, SPA-1, SPA-2, SPA-3, SPB-1, SPB-2, SPB-3 and CVS-B. The lower length opens on SPB-3 and CVS-B again, then OOB-B, then A08, B08 through A15, B15. The trays are drawn as bands along both lengths, labeled TA, TL and TB at the left of each length. The caption gives a long name for a single ID: A01 = NETA-CU01. It does not print long names for the other A and B IDs on this sheet. Power A / B carries PDU A1/A2 and B1/B2 branch circuits (existing supply input). Wet carries CDU secondary piping (facility context).

Status

The title block names this drawing Pathway plan: fibre trays and under-floor channels, in the K&K Data GPU Hall — Network Reference Design, and marks it Public Edition P2. The number is N-501-EN, sheet 24 of 30, dated 2026-10-05, scale 1:150, units mm. The status line reads: reference design for study and evaluation — not for construction. Two notes are left open on the sheet. Note 3 says tray hangers bear on the roof purlins, and marks hanger, seismic bracing and purlin capacity CONFIRM (structural engineer). Note 4 marks penetrations of the partition for power branches as position CONFIRM (facility). The wet route is marked facility context twice: in the schedule, as CDU secondary piping, and in the caption, as W = wet at Y2250. Nothing on this sheet closes those CONFIRM items. The sheet is part of the Public Edition P2 network reference design for the GPU hall reference.

Sheet guide — the devices on this drawing

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This sheet is one page of the GPU Hall Network Reference Design — Public Edition P2 (75 pages, 1.6 MB) — a direct PDF download with a published SHA-256 checksum, no registration. The complete coordinated set is on the downloads page. Background guides: data center one-line diagrams · GB300 NVL72 facility requirements · liquid cooling and CDU design.